Jump to content
SAU Community

Recommended Posts

Hi guys

I've noticed my Rb26 (R33) slowly looses oil over a period of time.

I've done two oil changes so far since i've had the engine and had to top up about 3/4 to 1 quart over the 4000km i run the oil for.

The first time i used Redline 20w50 and thought it was just probably the oil so i tried Schaeffer 20w50 but same result.

There are no oil leaks anywhere and when i opened the catch can after the two the oil changes there was only just enough oil just to cover the bottom(greddy)..... just a few drops really.

Compression reads: 172 / 175 / 173 / 170 / 156 / 160.

There is no smoke on start up, and my friend who was driving behind me says there is only some black smoke for a few seconds when i floor it.... no blue smoke.

It is running really rich because it has a little soot on the back and pops every now and again when a let go.... stock ecu running 12psi

Other wise car pulls really good

Where does my oil go???

Link to comment
https://www.sau.com.au/forums/topic/293879-disappearing-oil/
Share on other sites

Check your cam cover gaskets. Notorious as shit on any skyline of its age. I'm forever replacing them for customers that lose around half-1 litre of oil every 5000km.

And it won't be your oil control rings, all they do is drag oil up the bore. Even if you were referring to the second ring it wouldn't be that unless it was blowing smoke, which he said it wasn't.

The only reason why I'm repeating it is because when you are losing oil...and you know you have a leak somewhere....no matter how big or small, fix the leak first, then ask the question.

It's common sense. It's also at the top of the engine so it's the best place to start considering the oil will move in a downward direction.

Here's a picture of a GTST with a normal leak from the rocker cover gasket.

post-10554-1257283807_thumb.jpg

It was also leaking from the front corners behind the top timing cover backing plate and leaking from the half moon seals at the back and leaking down on top of the gearbox.

This one appeared not too bad from the top. It wasn't until looking from underneath that you will see where it is coming from.

My 32GTR is daily driven about 110km each day of the week and I don't lose oil like you are stating. I had the rocker cover leak at one point but just tighten the screws up regularly now and don't see the issue anymore. But it is apparently a common thing for the rocker covers to work lose.

Nissan says the standard is 170 psi with a variance of 14 psi across cyl so the lower numbers (156,160) is what i would actually expect for an engine with this kind of mileage .....water pump,timing belt,tensioner etc. has already been changed in Jap.

Its the higher numbers that has me baffled bc i tested a next 26 with a genuine 25k on the clock using the same gauge and all cyl were between 162-170

Nissan says the standard is 170 psi with a variance of 14 psi across cyl so the lower numbers (156,160) is what i would actually expect for an engine with this kind of mileage .....water pump,timing belt,tensioner etc. has already been changed in Jap.

Its the higher numbers that has me baffled bc i tested a next 26 with a genuine 25k on the clock using the same gauge and all cyl were between 162-170

Did you have a jump pack connected, throttle fully open and all spark plugs out for the compression test?

If not, then the results don't mean anything as they will most likely be a few psi off...usually under

I have never had to top up oil on any of my RB26s and i've had a fair few, from stock 1989 engine to brand new N1 Nur motors to built motors and none of them used oil between changes. granted my changes tend to be fairly quick as most got some track use and get fresh oil then, but they always gave back out pretty much what was put in. there is definitely something wrong happening. in normally healthy state RB26s do not burn or loose oil.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Howdy all Im in a little predicament and wondering what everyone’s thoughts are? I’ve had my long block rebuilt and am in the market for a turbo due to my old one having metal shavings from crank bearings (cause of rebuild) go throughout the turbos oil lines and there wheel has a little play. I’m not really aiming for any power, just trying to keep it as oem as possible, but I can’t find a turbo that’s built for the stock ecu or find something that would be a standard replacement. Anyone have any ideas or suggestions 
    • How's everyone going? Just a shout-out introducing myself. I'm James, I live on the north side of Brisbane. I bought an R33 that had been left to rot in someone's front yard for 14 years. Apparently, it has immobiliser/fuel issues. Long story short, it's suffering from a seized engine, plus whatever else turns up once it runs. The car is pretty good considering it sat for so long. It pretty much died after being imported. It has a bunch of Jap parts and a full Top Secret body kit. It's painted Fiat Turchese Festival, or aqua blue if you're not French. Another project to throw money at!
    • So the clockspring is responsible for the indicators cancelling on their own? I thought that was the function of that white thing in the center (any idea what it's called?)
    • Can you log IAT? Whilst WTA coolers have their place, doing any sort of sustained run is not one of them There are fixes that slow down the heat soak, like ice boxes, which don't last that long, and interchillers, which are fairly expensive, up grades to the WTA cooling radiator, which may require a bigger pump, and upgrades to the reservoir size,  and upgrades to the cooling fans, but, it all still heat soaks, and takes ages to come down in hot weather  For a turbo, that isn't locked into WTA like my PD blower is, can you not possibly swap to a nice air to air intercooler????, it would be better for sustained runs then, and have alot less things that could go wrong in my opinion 
    • So, the other thing I've sorted is a baseline dyno run up at Unigroup's new location. The auto trans was a little unco-operative by both shifting down when the throttle was floored on the dyno (so Mark had to ramp it up more slowly than in a manual) and also by shifting up at 6,000 even in sports mode instead of the indicated redline of 7,000 Still, on a hot day it made 240rwkw at 16psi which seems about right for 300kw (400hp) through an auto at the wheels.  The shape of the curve is not quite right because it was not full throttle to about 4,500 to stop it kicking down, but until I can get a tune on the auto trans control this was the best we could do.....full boost will be well below 5,000 once that is sorted, I'll get some data logs when I can to confirm For comparison, the R32 made 255 at 12psi (at 4,500) on the same dyno with tune, n1 turbos, cam gears, big exhaust but otherwise all standard so the v37 is likely a little better out of the box. One thing that is very clear is that the standard water to air intercoolers are not up to sustained use at full throttle in warm ambient temps. After about 5 runs (so only a few minutes full throttle), it was pulling boost and timing and dropping 10-15% power. Unfortunately I didn't get that printout and the Unigroup guys are away at the moment, will try and get hold of it on their return. So, looks like a healthy engine to start modifying and the only real area of concern is the w2a heat exchangers which the aftermarket has plenty of solutions for    
×
×
  • Create New...